Tension device for grain-binding machines



P. R. MART-IN. TENSION DEVICE FOR GRAIN BINDING MAGHINES.

' Patented Sgpt. 29, 1 896;.

ATTORNEYS.

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PATENT FFIcE.

PHILIP R. MARTIN, OF BUFFALO, NORTH DAKOTA.

TENSION DEVICE FOR GRAIN-BINDING MACHINES.

SPECIFICATION forming part of Letters Patent No. 568,621, datedSeptember 29, 1896.

Application filed November 26, 1895. $614M 5701200! (N modem Myinvention relates to an improvement in twine-holders and tension devicesadapted for connection with the binding mechanism or self-bindingharvesters; and the object of the invention is to construct in a simpleand economic manner a tension devicefor grainupon any convenientsupport.

binding machines by which the same tension may be applied to twinewhether it be fine or coarse, rough or smooth, and, furthermore, toprovide a means whereby the tension may be expeditiously andconveniently regulated, and to so construct the machine that it will beexceedingly simple and light and yet strong and durable.

The invention consists in the novel construction and combination of theseveral parts, as will be hereinafter fully set forth, and pointed outin the claims.

Reference is to be had to the accompanying drawings, forminga part ofthis specification,

in which similar characters of reference in-.

dicate corresponding parts in all the figures. Figure 1 is a frontelevation of the tension device and twine-holder. Fig. 2 is a plan viewof the same, and Fig. 3 isa vertical sec- Eion taken substantially onthe line 3 3 of In carrying out the invention a back board or plate A isprovided having a loop, link, or eye 10 at its top, whereby the saidplate or backboard may be hung up under the binder A post 11 is securedin the back plate or board near one of its ends, and upon this post alarge friction-wheel B is mounted to revolve. This Wheel is providedwith a peripheral V- groove 12, made quite deep, and the side walls ofthis groove are undulating or scalloped in such manner as to formalternating convexed surfaces 12 and concaved surfaces 12 the convexedsurfaces of one wall being opposite the concaved surfaces in theopposing wall of the aforesaid groove, as is shown in Figs. 2 and 3. Awasher 13 is loosely mounted on the post at the rear of thefriction-wheel B,

being in engagement with the said wheel, and a second washer 14 islikewise mounted on the post engaging with the wheel, while a cotter-pin15 is passed through the outer end of the post in front of the outerwasher 14.

A spring-plate 16 is perforated at one end to receive the post 11 andengages (at said perforated end) the washer 13. Above the post thespring-plate is fulcrumed upon a raised bar 17, carried by the back barA. By these means the plate is allowed a rocking movement. Anadjusting-screw 18 is passed through the upper end of the plate and intothe backboard A of the device, and by moving inward the screw 18 thelower end of the spring-plate will bear against the rear Washer 13,causing it to bind against the frictionwheel B and force the wheelagainst the outer washer 14, thus increasing the tension on theaforesaid friction-wheel, enabling it to run less freely. I By reversingthis operation the wheel is allowed easier movement.

Opposite the grooved portion of the tensionwheel B a shoe 0 is locatedon the back plate or board. This shoe is provided with a tubular outerend 19, a central segmental cavity 20, and an extension 21 from itsinner end, the said extension being located in front of the groovedportion of the tension-wheel B,

and it is provided with an opening 22, having.

a downward inclination and communicating with the aforesaid recess 20,the opening 22 being tangential to the base of the V-groove of theaforesaid friction-wheel. The shoe is secured to the back plate by meansof a screw 23 or its equivalent, passed through the shoe at or near itslowerinner corner. An arm 24 is hinged to the outer top portion of thetubular extremity of the shoe, and this arm is provided with side lugs25, extending downward practically within the recess 20 of the shoe, andin these lugs the trunnions or their equivalents of a friction-roller 27are j ournaled, the roller being smaller than the friction-wheel, and itis provided with a serrated or roughened peripheral surface, and theroller is normally held to revolve within the recess 20 of the shoe, sothat it will contact with any object passed along the bottom of the shoeby reason of a spring 29, secured to the back plate or board and havingconstant downward bearing on the inner end of the aforesaid arm. Thesaid arm is provided with a slot or opening 26 in its upper surface,through which the roller may extend. At the outer side of thefriction-wheel B an eye 30 is secured to the back plate or board.

The device is hung under the binder, and the twine 31 is made to passfrom the source of supply through the tubular end of the shoe beneaththe friction-roller 27, 011 through the inclined slot 22 and once aroundthe frictionwheel 15, and from thence through the eye 30 to the binder.The peculiar construction of the friction-wheel B effectually preventsthe cord from slipping thereon, gripping the same tightly, and thefriction-roller 27 guides the cord and at the same time prevents anyundue tension and the cord from unwinding too rapidly from thefriction-wheel 13.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. A tension device, consisting of a plate or supporthaving a fixed post, a frictionwheel provided with a peripheralV-groove, mounted to revolve loosely on the said post, a washercontrolling the outward movement of the wheel on the post, aspring-plate adapted to engage with the rear of the said wheel, anadjusting device whereby one portion of the plate may be made to bear toa greater or a less degree against the said wheel, a shoearrangedadjacent to the wheel, and a springpressed guide-roller located withinthe said shoe, as and for the purpose set forth.

2. In a tension device, a support, a post attached thereto, a wheelmounted to revolve on the said support, washers loosely mounted on thepost at the front and back of the wheel, a tension device provided withan adjusting mechanism, engaging with one face of the wheel, a shoearranged adjacent to the wheel, a spring-controlled arm pivoted on thesaid shoe, and a guide-roller j ournaled in the said arm and adapted torevolve in the said shoe, as and for the purpose set forth.

3. A tension device having a plate, a post projecting from the plate, agrooved wheel mounted on the post, a pivotally-mounted plate carried onthe post and capable of hearing against the side of the grooved wheel toretard the revolution thereof, a shoe carried by the support, an armpivotally mounted adjacent to the shoe, a roller carried by the arm, andmeans for pressing the roller against the shoe, substantially asdescribed.

PHILIP R. MARTIN. Witnesses:

JAMES A. \VmsLoE, U. A. PETERSON.

